Review on External System Equivalent Method of Power Systems Electromagnetic Transients Simulation

2014 ◽  
Vol 543-547 ◽  
pp. 493-498
Author(s):  
Yi Peng Yan ◽  
Yue Gu ◽  
Mei Liu ◽  
Wei Jian Zhu
Keyword(s):  
Power Systems ◽  
Large Scale ◽  
Simulation System ◽  
Electromagnetic Transients ◽  
Type Method ◽  
Advantages And Disadvantages ◽  
Long Time ◽  
Key Issues ◽  
Equivalent Method ◽  
Development Tendency

Electromagnetic transients simulation for the actual large-scale power systems usually needs long time. How to achieve the equivalent circuit of the external system and reduce the simulation system scale is one of hot topics in this field for a long time. In the paper, the main equivalent methods of external system are classified, the main content and process of each type method are described and its advantages and disadvantages are analyzed. On this basis, the development tendency and the key issues needing to be broken through for the external system equivalent method of power systems electromagnetic transients simulation are also presented in the paper.

scholarly journals Networked HIL Simulation System for Modeling Large-scale Power Systems

2021 ◽  
Author(s):  
Fuhong Xie ◽  
Catie McEntee ◽  
Mingzhi Zhang ◽  
Ning Lu ◽  
Xinda Ke ◽  
...  
Keyword(s):  
Power Systems ◽  
Large Scale ◽  
Simulation System ◽  
Hil Simulation

Study on Fault Tolerance for Virtualization-Based Computer Simulation Systems

2011 ◽  
Vol 201-203 ◽  
pp. 677-680
Author(s):  
Lei Ren ◽  
Yong Liang Luo ◽  
Ya Bin Zhang
Keyword(s):  
Computer Simulation ◽  
Fault Tolerance ◽  
Large Scale ◽  
Simulation System ◽  
Live Migration ◽  
Geographically Dispersed ◽  
Modern Computer ◽  
Time Simulation ◽  
Long Time ◽  
Migration Method

Modern computer simulation system has developed towards the direction of large-scale and distributed computing pattern. The large-scale simulation applications always deploy over heterogeneous networks across geographically dispersed locations, and the simulation process often lasts for a long time without intermission. The challenge is that various errors cannot be avoided during a long continuous running time in such a broad network environment with a huge number of simulation resources. The problem of simulation fault tolerance has become a hot issue. This paper introduces live migration method to virtualization-based computer simulation system, handling reliability problems, especially fault tolerance issues. The paper presents a framework of simulation fault tolerance. Then the detailed live migration mechanism of run-time simulation is discussed. The method can provide an approach to consolidating the reliable simulation in distributed and long-term simulation applications.

scholarly journals Governance models for robotic process automation: The case of Nordea Bank

2020 ◽  
pp. 204388692093702
Author(s):  
Damian Kedziora ◽  
Esko Penttinen
Keyword(s):  
Large Scale ◽  
Business Processes ◽  
Process Automation ◽  
General Data Protection Regulation ◽  
Robotic Process Automation ◽  
Advantages And Disadvantages ◽  
Decision Points ◽  
Wide Range ◽  
External Reporting ◽  
Key Issues

The teaching case addresses the governance of robotic process automation at Nordea, a large banking group operating primarily in the Nordic region. Nordea has deployed numerous software robots, for a wide range of business processes, from transaction-processing work and both internal and external reporting all the way to interaction with end users in handling of General Data Protection Regulation (GDPR)-related queries. The scene is set with a meeting where three people discuss the current state of robotic process automation implementation at Nordea: Group Head of Robotics Agnieszka Belowska Gosławska, Head of Robotic Process Automation Operations Piotr Stolarczyk and Acting Head of Robotics Execution Jaroslaw Motylewski. The presentation outlines several governance-related issues and decision points that must be addressed in connection with any deployment of robotic process automation at somewhat large scale within a company. The key issues are related to the software’s development and maintenance, robotic process automation governance and IT infrastructure. Students who have worked through the case should be able to (1) describe archetypal and hybrid governance modes for robotic process automation and (2) evaluate their advantages and disadvantages for solid infrastructure and effective software development and maintenance.

Parallel Algorithm for Transient Stability Online Simulation

2012 ◽  
Vol 433-440 ◽  
pp. 4446-4451
Author(s):  
Tian Liang Xue ◽  
Fang Zong Wang ◽  
Jing Ye
Keyword(s):  
Power Systems ◽  
Power System ◽  
Parallel Algorithm ◽  
Large Scale ◽  
Transient Stability ◽  
Online Assessment ◽  
Type Method ◽  
Online Simulation ◽  
Time Simulation ◽  
Implicit Trapezoidal Rule

Parallel computation is an effective approach to real-time simulation and transient stability online assessment of large-scale power systems. In this paper, the s-stage 2s-order symplectic Runge-Kutta-Nyström method is adopted for transient stability simulation of power system using classic model. Using Butcher transformation, a new parallel algorithm has been derived. The proposed algorithm has the convergence characteristic of a Newton type method and is of fully parallel-in-time. Through numerical simulation where the IEEE 145-bus power system is used, the proposed algorithm has been tested and compared with the conventional parallel-in-time Newton approach using implicit trapezoidal rule.

FORTRAN — should this be the engineer's computer language?

1982 ◽  
Vol 9 (3) ◽  
pp. 477-482 ◽  
Author(s):  
A. A. Mufti ◽  
L. G. Jaeger
Keyword(s):  
Programming Languages ◽  
Large Scale ◽  
Computer Language ◽  
Application Software ◽  
Engineering Programs ◽  
Advantages And Disadvantages ◽  
Future Developments ◽  
Steady Improvement ◽  
Long Time ◽  
Character Set

The authors consider the advantages and disadvantages of FORTRAN as the usual computer language for engineers, by comparison with such other possibilities as PASCAL, APL, PL/1, and ALGOL. The comparisons are based upon several distinguishing parameters, among which are stability of the language over a relatively long time-span, evolution towards a more structured form, existing investment in software for engineering applications, and the question of whether the language is of the compiler or interpreter type in normal usage.The evolution of FORTRAN to the present (FORTRAN 77) is traced and future developments are indicated. The case is made that FORTRAN and APL are not directly comparable with one another, since one is of the compiler family whilst the other is an interpreter type. It is argued that APL cannot be the language for large-scale engineering programs because of its interpreter nature.Comparison between FORTRAN and other compiler languages is also made directly. The conclusion reached is that FORTRAN has proved itself capable of being stable over long periods, of being well suited to engineering because of its intermediate level of mathematical sophistication, of being capable of steady improvement towards a more structured condition and of being the vehicle for a massive investment in software. It is therefore recommended that FORTRAN continue to be the principal computer language of engineers. Keywords: programming languages, application software, compiler, interpreter, character set, stability, evolution.

A Novel Method of Static Security Analysis Based on Multithread Technology

2013 ◽  
Vol 732-733 ◽  
pp. 639-645
Author(s):  
Bi Qiang Tang ◽  
Yi Jun Yu ◽  
Shu Hai Feng ◽  
Feng Li
Keyword(s):  
Power Systems ◽  
Large Scale ◽  
Power Grid ◽  
Security Analysis ◽  
Power Grids ◽  
Long Time ◽  
Grid Construction ◽  
Static Security ◽  
Bulk Power ◽  
Grid Operation

With the UHV (Ultra High Voltage) power grid construction and the interconnection of regional power grids, the scale of power grids in China is increasing rapidly. At the same time, significant uncertainty and variability is being introduced into power grid operation with the integration of large-scale renewable energy in power systems. All of these pose an enormous challenge to the operation control of power systems in China. For a long time, online static security analysis, as an important part of EMS (Energy Management System), has been an effective tool for power grid operation. However, it is increasingly difficult for traditional static security analysis in serial computing mode to be online applied in bulk power grids in China. A new practical parallel approach for online static security analysis is put forward in this paper. A multithread parallelism is introduced into contingency screening, detailed contingency evaluation and decision support for reducing the execution time. By employing the multithread technology, the hardware resources of multi-processor/multi-core computer can be fully used and the program can be speeded up effectively. The performance of the parallel static security analysis is demonstrated by tests on two large-scale power systems. The test results show that the proposed method can be online applied in real bulk power grids.

TO THE QUESTION OF RESPONSIBILITY FOR TORTURE IN THE RUSSIAN FEDERATION

2020 ◽  
Vol 10 (2) ◽  
pp. 103-106
Author(s):  
ASTEMIR ZHURTOV ◽  
Keyword(s):  
Human Rights ◽  
Russian Federation ◽  
Large Scale ◽  
Human Life ◽  
International Standards ◽  
World Community ◽  
The World ◽  
Long Time ◽  
Protection Of Human Rights ◽  
The Russian Federation

Cruel and inhumane acts that harm human life and health, as well as humiliate the dignity, are prohibited in most countries of the world, and Russia is no exception in this issue. The article presents an analysis of the institution of responsibility for torture in the Russian Federation. The author comes to the conclusion that the current criminal law of Russia superficially and fragmentally regulates liability for torture, in connection with which the author formulated the proposals to define such act as an independent crime. In the frame of modern globalization, the world community pays special attention to the protection of human rights, in connection with which large-scale international standards have been created a long time ago. The Universal Declaration of Human Rights and other international acts enshrine prohibitions of cruel and inhumane acts that harm human life and health, as well as degrade the dignity.Considering the historical experience of the past, these standards focus on the prohibition of any kind of torture, regardless of the purpose of their implementation.

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